A hot tub tax deduction is available only when a physician prescribes the tub to treat a specific diagnosed medical condition, and even then the deductible amount is often smaller than what you paid. The write-off falls under Section 213 of the Internal Revenue Code, which lets you deduct unreimbursed medical expenses that exceed 7.5% of your adjusted gross income.1Office of the Law Revision Counsel. 26 USC 213 – Medical, Dental, Etc., Expenses Buying a tub “for your health” does not qualify. You need a diagnosed condition, a written recommendation, receipts, and, for a permanent installation, an appraisal showing what the tub did to your home’s value.
When a Hot Tub Counts as a Medical Expense
The IRS defines medical care as amounts paid for the diagnosis, cure, mitigation, treatment, or prevention of disease, or for affecting a structure or function of the body. Expenses that are “merely beneficial to general health” are excluded, and the agency specifically calls out health club dues and similar general-wellness spending as non-qualifying.2Internal Revenue Service. Publication 502 (2025), Medical and Dental Expenses
That line is where hot tub claims live or die. A tub prescribed by a rheumatologist to manage degenerative arthritis is a medical expense. A tub bought because soaking feels good after work is not, even if it happens to lower your blood pressure. The question is whether the spending targets a specific diagnosed condition or improves overall well-being.
Conditions that commonly support a hydrotherapy prescription include arthritis, fibromyalgia, chronic back injuries, and certain musculoskeletal or neurological disorders. Publication 502 uses arthritis as an example when discussing medically necessary home modifications, which signals the IRS recognizes it as a legitimate basis.2Internal Revenue Service. Publication 502 (2025), Medical and Dental Expenses There is no official list. What matters is a documented link between your diagnosis and the prescribed treatment.
Documentation to Get Before You Buy
Get a written recommendation from a licensed physician before purchase. The letter should name your diagnosed condition, explain why hydrotherapy is medically necessary for that condition, and specify the hot tub as the treatment. A vague note that says the patient “would benefit from warm water therapy” is not enough. General-wellness language (“recommended for stress relief,” “beneficial for overall wellness”) will get the deduction denied.
Keep every piece of paper: the physician’s letter, the purchase and installation receipts, and, for a built-in unit, the property appraisal described below. You do not send these with your return, but you need them on hand if the IRS asks.2Internal Revenue Service. Publication 502 (2025), Medical and Dental Expenses
Portable Tub or Permanent Installation
The IRS treats these two categories differently, and the difference drives your deduction.
A freestanding, plug-in hot tub that sits on a patio and could be moved to another home is treated as medical equipment. The full purchase price counts as a medical expense, subject to the 7.5% AGI floor. Because you haven’t permanently altered the property, there is no home-value adjustment.
An in-ground spa, a built-in unit with custom plumbing and electrical work, or any installation that becomes a fixture is treated as a capital improvement. For capital improvements, the IRS requires you to subtract any increase in your home’s fair market value from the cost, and only the remainder counts as a medical expense.3Internal Revenue Service. Publication 502 (2025), Medical and Dental Expenses – Section: Capital Expenses
How the Home-Value Reduction Works
The regulation under Section 213 says the cost of a medically necessary improvement must be reduced by any increase in the home’s value caused by the installation. Only the excess is deductible.4eCFR. 26 CFR 1.213-1 – Medical, Dental, Etc., Expenses
Say you spend $18,000 on a built-in hot tub including installation, wiring, and plumbing, and an appraiser determines your home’s value rose by $5,000. Your deductible medical expense is $13,000. If the appraiser finds the installation added no value at all, the full $18,000 is deductible. If the value increase equals or exceeds what you paid, the capital cost produces no medical deduction.
A professional appraisal showing your home’s value immediately before and immediately after the installation is the strongest way to document this. Without one, the IRS can disallow the whole amount.
The Portion You Can’t Deduct Isn’t Lost
The amount that increased your home’s value gets added to your home’s tax basis, which reduces the taxable gain when you sell. The amount you deducted as a medical expense does not go into basis; you cannot take a current deduction and also shrink a future capital gain on the same dollars.5Internal Revenue Service. Publication 551 (12/2025), Basis of Assets – Section: Deducting vs. Capitalizing Costs In the example above, the $5,000 goes to basis and the $13,000 does not. Keep the appraisal and your deduction math with your home records so you can reconstruct the basis adjustment years later.
Operating Costs Are Also Deductible
Once the hot tub is established as medically necessary, the recurring costs of running it are deductible medical expenses too. This holds even if the home-value reduction wiped out your deduction on the tub itself.6Internal Revenue Service. Publication 502 (2025), Medical and Dental Expenses – Section: Operation and Upkeep Eligible costs include the electricity to run the unit, water, sanitization chemicals, and repairs such as replacing a heater or pump. Track these separately, with dedicated receipts, rather than trying to estimate the tub’s share of general household utilities after the fact.
If your family also uses the tub recreationally, allocate operating costs between medical and personal use based on time. Publication 502 uses a similar time-based allocation for attendant care that mixes medical and household duties.2Internal Revenue Service. Publication 502 (2025), Medical and Dental Expenses If your doctor prescribes 10 hours a week of hydrotherapy and the family uses the tub for another 5 hours recreationally, two-thirds of operating costs are deductible. Keep a contemporaneous log of your prescribed treatments. Without one, you have no defense if the allocation is challenged.
The IRS also limits deductions to reasonable costs to accommodate a home to a medical condition. Luxury features driven by personal taste, such as a built-in waterfall, custom lighting, or premium landscaping around the spa, are personal expenditures, not medical.3Internal Revenue Service. Publication 502 (2025), Medical and Dental Expenses – Section: Capital Expenses
The 7.5% AGI Floor and Itemizing
Qualified medical expenses go on Schedule A as an itemized deduction, and only the portion of your total medical expenses that exceeds 7.5% of AGI is deductible.1Office of the Law Revision Counsel. 26 USC 213 – Medical, Dental, Etc., Expenses With $100,000 in AGI, the first $7,500 of medical expenses produces no deduction. The hot tub expense stacks with your other medical costs, so a year that also includes surgery or major dental work clears the threshold more easily.
Itemizing only helps if your total itemized deductions exceed the standard deduction. For 2026 the standard deduction is $16,100 for single filers, $32,200 for married couples filing jointly, and $24,150 for head of household.7Internal Revenue Service. Rev. Proc. 2025-32 If your medical deduction plus your other itemized deductions (state and local taxes, mortgage interest, charitable contributions) does not clear that number, the hot tub write-off produces no real tax savings.
Insurance, HSAs, and FSAs
You can only deduct medical expenses that are not compensated by insurance or any other source.8Internal Revenue Service. Topic No. 502, Medical and Dental Expenses If insurance, a workers’ compensation settlement, or a legal judgment covers part of the cost, subtract that reimbursement before you calculate the deduction. Most standard health insurance policies do not cover hot tub purchases.
Health savings accounts and flexible spending accounts generally do not treat hot tubs as eligible expenses without extra documentation. A Letter of Medical Necessity from your doctor identifying the diagnosed condition and the treatment will convince some plan administrators to approve reimbursement, but not all. Check with your administrator before assuming you can pay with HSA or FSA funds.
Where Hot Tub Deductions Usually Fail
Hot tub claims attract scrutiny because most people buy hot tubs for enjoyment. The common failure points are predictable. A verbal recommendation from a doctor carries no weight in an audit, so the prescription needs to be written and dated before purchase. A note that references stress relief or general wellness rather than a diagnosed condition gets treated as a general health expense. A permanent installation without a before-and-after appraisal has no defensible deduction amount. Operating cost deductions without a usage log fall apart when the tub is also used recreationally. And luxury features beyond the functional requirements of the treatment do not qualify at all.
Treat this deduction as one you will have to defend. Build the file before you file the return: the physician’s letter naming the condition, the receipts, the appraisal for any built-in unit, and a running log of prescribed use. Reconstructing documentation after an audit notice arrives is a much weaker position than having it ready from the start.